Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Variable screening"”.
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Spatial Infectious Disease Transmission Models: Variable Screening Methods and Logistic Formulation.
… thesis aims to investigate and compare various variable screening methods for individual-level disease transmission models. The methods include least absolute shrinkage and selection operator (Lasso), forward and backward stepwise Akaike information criterion (AIC), variable random selection …
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Variable screening and graphical modeling for ultra-high dimensional longitudinal data
Ultrahigh-dimensional variable selection is of great importance in the statistical research. And independence screening is a powerful tool to select important variable when there are massive variables. Some commonly used independence screening procedures are based on single replicate data and are …
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Model-Free Variable Screening, Sparse Regression Analysis and Other Applications with Optimal Transformations
<p>Variable screening and variable selection methods play important roles in modeling high dimensional data. Variable screening is the process of filtering out irrelevant variables, with the aim to reduce the dimensionality from ultrahigh to high while retaining all important variables. Variable …
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Variable screening and model selection in censored quantile regression via sparse penalties and stepwise refinement
Many variable selection methods are available for linear regression but very little has been developed for quantile regression, especially for the censored problems. This study will look at the possibilities of utilizing some existing penalty variable selection methods on censored quantile …
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Principal Component Regression for Construction of Wing Weight Estimation Models
… of approximation methods: data generation and variable screening, fitting the data by a parametric function model, tuning intrinsic model parameters by using cross-validation, and verification of constructed approximation. One controversial topic is the assessment of the constructed …
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Knowledge and attitudes towards prostate cancer screening among males at Dzingahe Village, Limpopo Province
Prostate cancer (PC) screening is a strategy to identify cancer before it causes symptoms. However, men’s participation in prostate cancer screening seems inadequate and remains a public health concern worldwide. This leads most men to be diagnosed with an advanced prostate cancer where cancer …
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Robust Feature Screening Procedures for Mixed Type of Data
… statistical applications. A large number of variable selection approaches via various forms of penalized least squares or likelihood have been developed to select significant variables and estimate their effects simultaneously in high dimensional statistical inference. However, in modern …
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CFD Modelling of Down-Sized GDI Engines: Fuel Injection, In-Cylinder Phenomena and Correlation to Engine-Out PN Emissions
… the impact of six relevant engine control variables on PN production. The randomised DoE approach enabled assessing a wide region of the typical passenger car operating envelope: engine load was varied between 20 and 140 Nm; engine speed in the range 2000 – 3500 rpm; injection pressure was …